public class Example3_1 {
  public static void main (String args[]){
    char a1 ='十',a2='点',a3='进',a4='攻';
    char secret = 'A';
    a1=(char)(a1^secret);
    a2=(char)(a2^secret);
    a3=(char)(a3^secret);
    a4=(char)(a4^secret);
    System.out.println("密文："+a1+a1+a3+a4);
    a1=(char)(a1^secret);
    a2=(char)(a2^secret);
    a3=(char)(a3^secret);
    a4=(char)(a4^secret);
      System.out.println("原文："+a1+a1+a3+a4);
  }
}
